Are you facing Time machine sparsebundle could not be accessed error -1? If yes then you are at the right place to get the most appropriate solution. Reasons like file system corruption, virus attack, system malfunctioning, etc are the most most common causes which can leads the users to such critical scenario. In such situation won't be able to access or restore the backup files created using Time machine utility. Users might get unable to use the Time machine feature as well. However Time machine sparsebundle could not be accessed error -1 can be fixed by reinstalling the OS, but as the process of OS reinstallation involves complete hard drive wipe out thus it is quite risky. Meanwhile it is only possible way to resolve this issue. Once the error get resolved completely then you lost Mac files can be restored back with the help of third party Mac Data recovery Software. It is very effective and able to rescue all lost Mac data in much easy, safe and convenient manner. Hence fix Time machine sparsebundle could not be accessed error -1 immediately and then rescue your all lost data on Mac with Mac Data Recovery Software.